Dynamo-electric machine.



J. W. BURLEIGH.

DYNAMO ELECTRIC MACHINE. APPLIOATION HLED AUG. 1o, 190s.

946,105. Patented Jan. 11,1910.

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JOHN WESLEY BRLEIGH, OF TAUNTON, ENGLAND, ASSIGNOR TO ZONE DYNAMO 8c'MOTOR PATENTS COMPANY LIMITED, OF LONDON, ENGLAND, A CORPORATION F GREATBRITAIN.

DYNAMO-ELECTRIC MACHINE.

Specification of Letters Patent.

Application filed August l0, 1908.

Patented Jan. 11, 1910.

Serial No. 447,781.

To all whom it may concern:

Be it known that I, JOHN VinsLnY BUR- LEIGH, a subject of the King ofEngland, residing at Taunton, in England, have invented certain new anduseful Improvements in Dynamo-Electric Machines, of which the followingis a specification.

My invention relates to dynamo electric machines, and has especialreference to an improved coil winding therefor.

In order that my invention may be readily understood reference is madeto the accompanying' drawings, in which similar letters refer to similarparts throughout the several views.

Figure I is a plan of a coil after it has been wound on a former butbefore it has been bent to shape, Fig. II is a view of the same coilafter it has been bent to an arched form as seen in elevation, Fig. IIIis a similar coil after it has been bent to an ogee shape as seen inelevation. Fig. IV a diagram of a well known form of two pole carcass towhich my coils may be adapted, Fig. V is a plan of a similar carcass,the cylindrical yoke being shown in section, showing the coils inposition, Fig. VI is a slightly modified form of arched coil, and Fig.VII a slightly modified form of ogee coil.

Referring to Fig. I, 1 is a coil of covered wire after it has been woundon a former but before it is bent to the proper shape for insertion inthe carcass of a machine. It will be seen that it is of elongated formand flat. To adapt it for use this coil is bent at or about the dottedlines 2 and 3 of the iigure. IVhen the bends are both in the samedirection what may conveniently be termed an arched coil is obtained.When the tlat coil is bent through angles less than right angles themodified form of arched coil shown in Fig. VI is obtained. lWhen howeverthe flat coil is bent at right angles in opposite directions that is tosay at or about the line 2 in one direction and at or about the line 3in the opposite direction then we get what may conveniently be termed anogee coil as is shown in Fig. III: and when these bendings are throughangles less than right angles we get the modified form of ogee coilshown in Fig. VII.

Referring now to Figs. IV and V it will be seen that the carcass is oneof well known form in which 4 is a cylindrical yoke having the polepieces 5, 5 projecting inward therefrom. The armature is not shown noris the supporting frame for the bearings which supporting frame mayconsist of brackets integral with the yoke as is well known.

In practicing my invention I provide each carcass as shown in plan inFig. V with two coils G, 7 one an arched coil and the other an ogee coilthese coils being however of different length the ogee coil somewhatlonger than the arched coil which it overlaps. In saying that the ogeecoil is longer than the arched coil what is meant is that eachconvolution or turn is longer and not necessarily that the total numberof turns or convolutions is greater. In inserting these coils into thecarcass the arched coil is first placed in position as shown in Fig. Vand then the ogee coil is mounted over it as shown in the figure, thatis to say over it at one end of the carcass though separated as will beseen on the opposite side of the carcass at the other end thereof. Itwill thus been seen that at one end 0f the carcass the coils overlapwhile at the other end they are spread apart the arched coil lying upagainst or close to one pole piece only and the ogee coil lying upagainst or close to one end of each pole piece. The straight parts 8, 9of the coils are intended to lie parallel to and as closely as possibleover those of the armature coils which are undergoing commutation.

It will be seen that in Fig. V I show the coils separatelyillustrated inFigs. II and III as employed but it is quite obvious that I mightsubstitute therefor the modified forms of coil shown in Figs. VI andVII. `When these latter forms of coil are employed a more gradualinductive effect is obtained when the machine is in operation.

The modified forms of coil shown in Figs. VI and VII are usually moreeasily slipped into position than those shown in Figs. II and III.

By means of my invention I secure almost sparkless collection at thebrushes of the machine and I greatly reduce the magnetic leakage as wellas the size and weight of the machine. Further I greatly reduce theamount of copper necessary and through the spacing apart of the twocoils particularly at the end at which they are spread out I facilitatecooling. The result is that I obtain a very cheap light and eliicientmachine.

It is of course to be understood that I use the term dynamo electricmachine in its generic sense including motors, motor generators and thelike as well as generators. It must also he understood that the twocoils mentioned may be so connected as to constitute in fact a singlecoil.

The coils have heen referred to as being first made flat and then bentto arched or ogee shape. It must be understood that they may be made onformers of such construction as to give them the arched and ogee shapesrespectively in the first instance, if desired.

What I claim as my invention and desire to secure by Letters Patent, is

l. In a dynamo electric machine the comhination of two field magnetcores, an armature; an arched coil adjoining one of the cores and havingstraight parts lying in the neutral zones close over and parallel withthe axis of the armature, and an ogee coil, the coils exciting bothiield magnet cores, and the curved partl of the ogee coil overlying thecurved'part of the arched coil on one side of one core while dii/'ergingfrom it on the other side of the machine and having a straight partadjoining the two curved parts lying in the neutral zone alongside thestraight part of the arched coil close over and parallel with the axisof the armature.

In a dynamo electric machine7 the combination of two field magnet coresan arched coil with an ogee coil exciting said cores, the straight partsof both of which lie alongside of each other in a neutral zone and closeover and parallel with the axis of the armature and a cylindrical yoke.

3. In a dynamo electric machine, in combination, a pair of field magnetcores oppositely located, an armature; a coil of arch form adjoining oneof said cores and an ogee coil having one end adjacent to the same coreand the other end of which is adjacent to the opposite core, thestraight parts of both coils lying in the neutral zones close to thearmature and parallel to its axis.

In testimony whereof I allix my signature in presence of two witnesses.

JOHN IVESLEY BURLEIGH.

IVitnesses EDWARD JAMES Porn, ARNOLD EDWIN REMFRY.

